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US6185809B1 - Method of manufacturing a diaphragm for an electroacoustic transducer - Google Patents

Method of manufacturing a diaphragm for an electroacoustic transducer Download PDF

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Publication number
US6185809B1
US6185809B1 US08/878,919 US87891997A US6185809B1 US 6185809 B1 US6185809 B1 US 6185809B1 US 87891997 A US87891997 A US 87891997A US 6185809 B1 US6185809 B1 US 6185809B1
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Prior art keywords
diaphragm
foil
positioning device
thickness
manufacturing
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Expired - Lifetime
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US08/878,919
Inventor
Gino Pavlovic
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AKG Acoustics GmbH
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AKG Acoustics GmbH
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Assigned to AKG ACOUSTICS GMBH reassignment AKG ACOUSTICS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PAVLOVIC, GINO
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/029—Diaphragms comprising fibres
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49005—Acoustic transducer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/4908—Acoustic transducer

Definitions

  • the present invention relates to a method of manufacturing a diaphragm for an electroacoustic transducer which operates in accordance with the electrodynamic principle and has portions with different thicknesses made from a thermoplastically deformable material having a constant thickness.
  • the behavior of the diaphragm is of particular importance for the manner of operation of each electroacoustic transducer because the behavior determines to a very significant extent the transmission properties of the transducer.
  • the behavior of the diaphragm depends very significantly on the shape of the diaphragm.
  • a diaphragm shape has been found generally very useful as it is schematically illustrated in FIG. 1 of the drawing.
  • the center of the diaphragm is dome-shaped and is surrounded by a toroidally-shaped part to which is connected, in turn, a rim for fastening the diaphragm to the magnetic system.
  • the moving coil which moves in a radially extending magnetic field is mounted underneath the dome.
  • the object of all structural measures is to achieve a piston-like movement of the moving coil at all frequencies and amplitudes.
  • the central dome should be of a construction which is as stiff as possible in order to suppress even at high frequencies the creation of vibration modes which would otherwise lead to drops in the frequency pattern.
  • the toroidally-shaped portion determines the resiliency and is frequently provided with indentations, or so-called crimpings, which extend tangentially relative to the inner diameter. For this reason, this portion is generally referred to by the term “crimped zone”. The softer this crimped zone, the better the sensitivity in the low frequency transmission range will be.
  • the diaphragm material which usually is present in the form of a foil, is pressed in a stamping mold while pressure and heat are applied. After a cooling phase, the foil is removed and subsequently the final diaphragm is punched out. Except for their different shapes, this method of manufacturing type does not make a difference between the dome-shaped zone and the crimped zone.
  • EP 0 446 515 A2 even proposes to provide the concave side of the dome with a metal fabric.
  • diaphragms are used which have partial areas with different thicknesses.
  • DE 38 38 853 C1 discloses a special thickness distribution of the central portion and the conical portion in order to ensure favorable transmission properties.
  • central dome-shaped portion Another possibility of increasing the stiffness of the central dome-shaped portion is to provide this portion with a special shape, for example, by a central indentation, as shown in FIG. 1 of EP 0 137 624 A2.
  • DE 43 29 637 A1 describes the formation of ribs.
  • the central dome-shaped portion is initially manufactured larger than desired and is subsequently provided in a second deformation process with randomly produced stiffening ribs.
  • a diaphragm of the above-described type with portions having different thicknesses is manufactured in a multistage thermoplastic stamping process from a material having a constant thickness.
  • a first work step that portion of the diaphragm material which is to have the greater thickness in the finished diaphragm, is held by an inner positioning device, while the remaining area of the diaphragm is additionally held by an outer positioning device, and the remaining area of the diaphragm is pulled or stretched with the influence of tension and heat to reduce the thickness thereof.
  • the entire diaphragm is thermoplastically stamped in a mold.
  • the dome-shaped portion of the diaphragm is stamped from the portion of the diaphragm material held by the inner positioning device and the remaining stretched area of the diaphragm material is stamped to form the crimped zone.
  • FIG. 1 is a cross-sectional view of a complete diaphragm with moving coil for an electrodynamic transducer
  • FIG. 2 is a schematic sectional view, on a larger scale, showing the inner and outer positioning devices with the diaphragm material held by the positioning devices;
  • FIG. 3 is a cross-sectional view similar to FIG. 2, showing an extension of the diaphragm material produced by a relative movement between the inner and outer positioning devices;
  • FIG. 4 is cross-sectional view showing the stretched diaphragm material and the significantly thicker middle portion thereof.
  • FIG. 5 is cross-sectional view showing the finished diaphragm of an electrodynamic transducer.
  • FIG. 1 is a sectional view of a complete diaphragm with moving coil for an electrodynamic transducer.
  • the central dome-shaped portion 1 is surrounded by a toroidally-shaped portion 2 .
  • the outer diaphragm rim 3 is used for fastening the diaphragm to the magnetic system, not shown.
  • the moving coil 4 is glued to the diaphragm. The diameter of the moving coil 4 corresponds approximately to the outer diameter of the central dome-shaped portion 1 .
  • the diaphragm material 5 is initially placed in a first device shown schematically in FIG. 2, which is composed of an inner positioning device 6 , 6 ′ and an outer positioning device 7 , 7 ′.
  • the inner positioning device 6 , 6 ′ holds that central portion 8 which is to have the greater thickness in the finished diaphragm. In the diaphragm of an electrodynamic transducer, this area will be circular and form the dome-shaped portion 1 .
  • the outer positioning device 7 , 7 ′ holds an area which corresponds approximately to twice the diameter of the finished diaphragm.
  • the positioning devices are each composed of two jaws 6 , 6 ′ and 7 , 7 ′, respectively, arranged above and below the diaphragm material 5 .
  • the two jaws 6 , 6 ′ and 7 , 7 ′, respectively, are pressed together tightly to such an extent that the diaphragm material 5 located therebetween is immovably secured.
  • the two jaws can additionally be provided with elastic sealing elements 12 , 12 ′ and 13 , 13 ′, respectively.
  • the thickness of the annular portion 9 between the inner positioning device 6 , 6 ′ and the outer positioning device 7 , 7 ′ can be reduced by carrying out a relative movement between the inner positioning device 6 , 6 ′ and the outer positioning device 7 , 7 ′ and by applying heat.
  • the heat necessary for stretching the diaphragm material 5 can be supplied by applying air or radiation.
  • the diaphragm material 5 is directly heated with hot air; in the second case, the surrounding components, i.e., the massive parts of the positioning devices, are electrically heated and these parts, in turn, radiate heat to the diaphragm material 5 .
  • FIG. 4 of the drawing shows the result of the first work step, i.e., a diaphragm foil which in its central portion 8 is thicker than in its rim portion 9 .
  • FIG. 5 shows a finished punched-out diaphragm whose dome 10 has a significantly greater thickness than the crimped zone 11 . It was possible in this manner to realize thickness differences between dome and crimped zone of about 50%.
  • the manufacturing method according to the present invention is particularly effective when both work steps are carried out in a single tool.
  • the outer and inner positioning devices and the final stamping mold can be combined and arranged so as to be axially moveable relative to each other, so that the manufacturing method according to the invention can take place automatically by means of a suitable control device.
  • the present invention makes it possible to manufacture a diaphragm with different thickness portions with practically the same effort as is required for manufacturing a conventional diaphragm.
  • This makes it possible to inexpensively manufacture diaphragms for electroacoustic transduces which have a thick dome-shaped zone and a thinner crimped zone which significantly improves the vibration behavior of the diaphragm.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

A method of manufacturing a diaphragm for an electroacoustic transducer which operates in accordance with the electrodynamic principle and has portions with different thicknesses made from a thermoplastically deformable material having a constant thickness, wherein, in a first work step, that portion of the diaphragm material which is to have the greater thickness in the finished diaphragm, is held by an inner positioning device, while the remaining area of the diaphragm is additionally held by an outer positioning device, and the remaining area of the diaphragm is pulled or stretched with the influence of tension and heat to reduce the thickness thereof. In a second workstep, the entire diaphragm is thermoplastically stamped in a mold.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of manufacturing a diaphragm for an electroacoustic transducer which operates in accordance with the electrodynamic principle and has portions with different thicknesses made from a thermoplastically deformable material having a constant thickness.
2. Description of the Related Art
The behavior of the diaphragm is of particular importance for the manner of operation of each electroacoustic transducer because the behavior determines to a very significant extent the transmission properties of the transducer. In addition to the material properties, the behavior of the diaphragm depends very significantly on the shape of the diaphragm. In electroacoustic transducers which operate in accordance with the electrodynamic principle, a diaphragm shape has been found generally very useful as it is schematically illustrated in FIG. 1 of the drawing.
The center of the diaphragm is dome-shaped and is surrounded by a toroidally-shaped part to which is connected, in turn, a rim for fastening the diaphragm to the magnetic system. The moving coil which moves in a radially extending magnetic field is mounted underneath the dome.
The object of all structural measures is to achieve a piston-like movement of the moving coil at all frequencies and amplitudes. For this purpose, it is necessary to construct the individual diaphragm portions differently in accordance with their function.
Thus, the central dome should be of a construction which is as stiff as possible in order to suppress even at high frequencies the creation of vibration modes which would otherwise lead to drops in the frequency pattern.
The toroidally-shaped portion determines the resiliency and is frequently provided with indentations, or so-called crimpings, which extend tangentially relative to the inner diameter. For this reason, this portion is generally referred to by the term “crimped zone”. The softer this crimped zone, the better the sensitivity in the low frequency transmission range will be.
These different requirements with respect to the various portions of a diaphragm of an electroacoustic transducer can be met in an optimum manner if each portion is constructed differently.
However, when manufacturing a diaphragm, these different requirements are frequently not taken into consideration. Thus, the diaphragm material, which usually is present in the form of a foil, is pressed in a stamping mold while pressure and heat are applied. After a cooling phase, the foil is removed and subsequently the final diaphragm is punched out. Except for their different shapes, this method of manufacturing type does not make a difference between the dome-shaped zone and the crimped zone.
Therefore, methods were frequently proposed which provide a stiffening of the dome-shaped zone. For example, by applying a second layer, a stiffening of the dome-shaped zone can be achieved. Thus, EP 0 446 515 A2 even proposes to provide the concave side of the dome with a metal fabric.
Another possibility of achieving a stiff dome area is to construct the diaphragm with different thicknesses. For example, in the construction of loudspeakers, diaphragms are used which have partial areas with different thicknesses. DE 38 38 853 C1 discloses a special thickness distribution of the central portion and the conical portion in order to ensure favorable transmission properties.
It is also possible to divide the diaphragm and to manufacture the central portion of a thicker material, as disclosed in EP 0 204 386 A1.
Another possibility of increasing the stiffness of the central dome-shaped portion is to provide this portion with a special shape, for example, by a central indentation, as shown in FIG. 1 of EP 0 137 624 A2. DE 43 29 637 A1 describes the formation of ribs. The central dome-shaped portion is initially manufactured larger than desired and is subsequently provided in a second deformation process with randomly produced stiffening ribs.
The methods described above are time-consuming and, thus, expensive.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to avoid the disadvantages discussed above and to provide a simple and precisely definable manufacturing method for diaphragms having portions with different thicknesses, which method can be used advantageously for electrodynamic transducers.
In accordance with the present invention, a diaphragm of the above-described type with portions having different thicknesses is manufactured in a multistage thermoplastic stamping process from a material having a constant thickness. In a first work step, that portion of the diaphragm material which is to have the greater thickness in the finished diaphragm, is held by an inner positioning device, while the remaining area of the diaphragm is additionally held by an outer positioning device, and the remaining area of the diaphragm is pulled or stretched with the influence of tension and heat to reduce the thickness thereof. In a second workstep, the entire diaphragm is thermoplastically stamped in a mold.
In accordance with another feature of the present invention, the dome-shaped portion of the diaphragm is stamped from the portion of the diaphragm material held by the inner positioning device and the remaining stretched area of the diaphragm material is stamped to form the crimped zone.
Finally, in accordance with another advantageous feature, all manufacturing steps are carried out in a single tool.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWING
In the drawing:
FIG. 1 is a cross-sectional view of a complete diaphragm with moving coil for an electrodynamic transducer;
FIG. 2 is a schematic sectional view, on a larger scale, showing the inner and outer positioning devices with the diaphragm material held by the positioning devices;
FIG. 3 is a cross-sectional view similar to FIG. 2, showing an extension of the diaphragm material produced by a relative movement between the inner and outer positioning devices;
FIG. 4 is cross-sectional view showing the stretched diaphragm material and the significantly thicker middle portion thereof; and
FIG. 5 is cross-sectional view showing the finished diaphragm of an electrodynamic transducer.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 is a sectional view of a complete diaphragm with moving coil for an electrodynamic transducer. The central dome-shaped portion 1 is surrounded by a toroidally-shaped portion 2. The outer diaphragm rim 3 is used for fastening the diaphragm to the magnetic system, not shown. The moving coil 4 is glued to the diaphragm. The diameter of the moving coil 4 corresponds approximately to the outer diameter of the central dome-shaped portion 1.
Referring to the figures of the drawing and the details shown in the drawing, the manufacturing method according to the present invention will now be described in detail.
The diaphragm material 5, usually present in the form of a foil, is initially placed in a first device shown schematically in FIG. 2, which is composed of an inner positioning device 6, 6′ and an outer positioning device 7, 7′. The inner positioning device 6, 6′ holds that central portion 8 which is to have the greater thickness in the finished diaphragm. In the diaphragm of an electrodynamic transducer, this area will be circular and form the dome-shaped portion 1. The outer positioning device 7, 7′ holds an area which corresponds approximately to twice the diameter of the finished diaphragm.
The positioning devices are each composed of two jaws 6, 6′ and 7, 7′, respectively, arranged above and below the diaphragm material 5. The two jaws 6, 6′ and 7, 7′, respectively, are pressed together tightly to such an extent that the diaphragm material 5 located therebetween is immovably secured. In order to prevent the diaphragm material from being damaged during holding, the two jaws can additionally be provided with elastic sealing elements 12, 12′ and 13, 13′, respectively.
As schematically illustrated in FIG. 3, the thickness of the annular portion 9 between the inner positioning device 6, 6′ and the outer positioning device 7, 7′ can be reduced by carrying out a relative movement between the inner positioning device 6, 6′ and the outer positioning device 7, 7′ and by applying heat.
The greater the relative movement between the inner positioning device 6, 6′ and the outer positioning device 7, 7′, the greater the reduction of the material thickness will be. Consequently, by suitably selecting the parameters of movement, a suitable means is available for producing a desired thickness of the annular portion 9.
The heat necessary for stretching the diaphragm material 5 can be supplied by applying air or radiation. In the first case, the diaphragm material 5 is directly heated with hot air; in the second case, the surrounding components, i.e., the massive parts of the positioning devices, are electrically heated and these parts, in turn, radiate heat to the diaphragm material 5.
It is advantageous if the supply of heat is carried out in such a way that preferably those portions of the diaphragm material are heated whose thickness is to be reduced. However, it is also conceivable to use a diaphragm material 5 which can be stretched in the cold state. In that case, heating can be entirely omitted.
FIG. 4 of the drawing shows the result of the first work step, i.e., a diaphragm foil which in its central portion 8 is thicker than in its rim portion 9.
Subsequently, in a second work step, this foil is now stamped and punched out by means of a conventional diaphragm mold. FIG. 5 shows a finished punched-out diaphragm whose dome 10 has a significantly greater thickness than the crimped zone 11. It was possible in this manner to realize thickness differences between dome and crimped zone of about 50%.
The manufacturing method according to the present invention is particularly effective when both work steps are carried out in a single tool. The outer and inner positioning devices and the final stamping mold can be combined and arranged so as to be axially moveable relative to each other, so that the manufacturing method according to the invention can take place automatically by means of a suitable control device.
Consequently, the present invention makes it possible to manufacture a diaphragm with different thickness portions with practically the same effort as is required for manufacturing a conventional diaphragm. This makes it possible to inexpensively manufacture diaphragms for electroacoustic transduces which have a thick dome-shaped zone and a thinner crimped zone which significantly improves the vibration behavior of the diaphragm.
While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.

Claims (4)

I claim:
1. A method for manufacturing a diaphragm for an electroacoustic transducer operating in accordance with the electrodynamic principle, the diaphragm having portions with different thicknesses and being manufactured from a foil of thermoplastically deformable material having a constant thickness, the method comprising, in a first work step, placing the foil of the thermoplastically deformable material into a device with an inner positioning device and an outer positioning device and holding by using the inner positioning device that portion of the foil which is to have a greater thickness in the finished diaphragm, while holding an outer portion of the foil additionally by using the outer positioning device, and stretching a remaining material portion of the foil between the inner and outer positioning devices in order to reduce the thickness of the remaining material portion of the foil, and, in a second work step, thermoplastically stamping the foil to a desired shape of the diaphragm in a mold.
2. The method according to claim 1, comprising applying heat to the foil during stretching of the remaining material portion of the foil.
3. The method according to claim 1, comprising forming a dome-shaped portion of the diaphragm from the foil held by the inner positioning device and stamping a crimped zone of the diaphragm from the remaining stretched portion of the foil.
4. The method according to claim 1, comprising carrying out the first and second work steps in a single tool.
US08/878,919 1996-06-19 1997-06-19 Method of manufacturing a diaphragm for an electroacoustic transducer Expired - Lifetime US6185809B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1085-96 1996-06-19
AT0108596A AT403751B (en) 1996-06-19 1996-06-19 METHOD FOR PRODUCING A MEMBRANE FOR AN ELECTROACOUSTIC TRANSDUCER

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US (1) US6185809B1 (en)
EP (1) EP0814637B1 (en)
JP (1) JP3927651B2 (en)
AT (2) AT403751B (en)
DE (1) DE59712472D1 (en)
DK (1) DK0814637T3 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6427017B1 (en) * 1998-11-13 2002-07-30 Nec Corporation Piezoelectric diaphragm and piezoelectric speaker
US20050180588A1 (en) * 2003-09-11 2005-08-18 Martin Opitz Transducer with deformable corner
WO2006087202A1 (en) 2005-02-18 2006-08-24 Akg Acoustics Gmbh Membrane for a dynamic converter
US20070261912A1 (en) * 2006-05-11 2007-11-15 Altec Lansing Technologies, Inc. Integrated audio speaker surround

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KR100338785B1 (en) * 1999-05-28 2002-05-31 허 훈 Manufacturing Method of Diaphragm for Dynamic Receiver of Cellular Phone
JP4557412B2 (en) 2000-11-20 2010-10-06 パナソニック株式会社 Speaker
EP1719385A1 (en) 2004-02-17 2006-11-08 Koninklijke Philips Electronics N.V. Method of and device for modifying the properties of a membrane for an electroacoustic transducer
CN102868959B (en) * 2012-10-12 2015-01-21 张百良 Aluminium strip speaker

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US3614335A (en) * 1968-08-08 1971-10-19 Int Standard Electric Corp Electroacoustic transducer held together by thermoplastic clamping ring
US3586792A (en) * 1970-02-24 1971-06-22 Int Standard Electric Corp Method for assembling electro-acoustical transducer diaphragm assemblies
US4132872A (en) * 1977-03-26 1979-01-02 Kenzo Inoue Ribbed conical-central dome diaphragm with tapered thickness components
JPS555168A (en) * 1978-06-27 1980-01-16 Matsushita Electric Ind Co Ltd Production of diaphragm for speaker
US4360711A (en) * 1979-10-20 1982-11-23 Plessey Overseas Limited Magnetic electro-acoustic transducer construction
JPS56141697A (en) * 1980-04-08 1981-11-05 Mitsubishi Electric Corp Preparation of vibration diaphragm for speaker
JPS58157293A (en) * 1982-03-15 1983-09-19 Mitsubishi Electric Corp Diaphragm for speaker
JPS58157294A (en) * 1982-03-15 1983-09-19 Mitsubishi Electric Corp Diaphragm for speaker
JPS5927697A (en) * 1982-08-04 1984-02-14 Sanyo Electric Co Ltd Join method of speaker diaphragm and edge
JPS59190799A (en) * 1983-04-14 1984-10-29 Onkyo Corp Fitting method of diaphragm edge
EP0137624A2 (en) 1983-08-16 1985-04-17 Stc Plc Electroacoustic transducer
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US5521886A (en) * 1993-06-28 1996-05-28 Sony Corporation Diaphragm for use with an electro-acoustic transducer and method of producing the same
DE4329637A1 (en) 1993-09-02 1995-03-09 Sennheiser Electronic Method for producing a contoured diaphragm for electroacoustic transducers such as headphones, and a transducer diaphragm produced in accordance with this method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6427017B1 (en) * 1998-11-13 2002-07-30 Nec Corporation Piezoelectric diaphragm and piezoelectric speaker
US20050180588A1 (en) * 2003-09-11 2005-08-18 Martin Opitz Transducer with deformable corner
US7711137B2 (en) 2003-09-11 2010-05-04 Akg Acoustics Gmbh Transducer with deformable corner
US20100195862A1 (en) * 2003-09-11 2010-08-05 Akg Acoustics Gmbh Transducer with deformable corner
US8411894B2 (en) 2003-09-11 2013-04-02 AKG Acoustrics GmbH Transducer with deformable corner
WO2006087202A1 (en) 2005-02-18 2006-08-24 Akg Acoustics Gmbh Membrane for a dynamic converter
US20080024036A1 (en) * 2005-02-18 2008-01-31 Martin Opitz Transducer membrane with symmetrical curvature
US8208679B2 (en) * 2005-02-18 2012-06-26 Akg Acoustics Gmbh Transducer membrane with symmetrical curvature
US20070261912A1 (en) * 2006-05-11 2007-11-15 Altec Lansing Technologies, Inc. Integrated audio speaker surround

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EP0814637B1 (en) 2005-11-09
AT403751B (en) 1998-05-25
DK0814637T3 (en) 2006-03-20
JP3927651B2 (en) 2007-06-13
DE59712472D1 (en) 2005-12-15
ATE309686T1 (en) 2005-11-15
EP0814637A3 (en) 2004-09-15
JPH1070794A (en) 1998-03-10
ATA108596A (en) 1997-09-15
EP0814637A2 (en) 1997-12-29

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